Gut cleansing will be performed using a split dose of MOVIPREP®, 1-litre solution (1x sachet A and 1x sachet B) in the evening prior to the day of colonoscopy and 1-litre solution (1x sachet A and 1x sachet B) in the morning of the colonoscopy, or PICOLAX®, 150 mL solution (1 sachet) before 8am on day prior to the day of colonoscopy, and 150 mL solution (1 sachet) 6 to 8 hours later.